Wahl DST400 User manual

DSTCAL Software
User Manual
Palmer Wahl Instruments, Inc.
234 Old Weaverville Road
Asheville, NC 28804
Toll Free 800-421-2853
Phone [phone]
Fax [phone]
www.palmerwahl.com
09/16/09
WD1037 Rev F
Revised 01/11/21

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Table of Contents
1. INTRODUCTION........................................................................................... 4
1.1. DSTCAL.............................................................................................................4
1.2. DSTCAL-Pro......................................................................................................4
2. DSTCAL KIT INSTALLATION AND SETUP................................................ 5
2.1. Kit Contents........................................................................................................5
2.2. DSTCAL Software Installation............................................................................5
2.3. Hardware Installation .........................................................................................5
2.4. Driver Installation ...............................................................................................5
3. SCREEN DEFINITIONS –RTD Models....................................................... 6
4. CALIBRATION –RTD Models..................................................................... 9
4.1. Theory of Calibration..........................................................................................9
4.2. Meter Calibration................................................................................................9
4.3. Probe Calibration .............................................................................................11
4.4. Error Windows..................................................................................................12
5. SCREEN DEFINITIONS - DSX Models: .................................................... 13
6. CALIBRATION –DSX Current Loop ........................................................ 15
6.1. Theory of Calibration........................................................................................15
6.2. Current Loop Calibration..................................................................................15
4-20 mA Calibration Window..................................................................................15
7. DST600 PROBE ID..................................................................................... 16
7.1. Theory of Operation.........................................................................................16
7.2. Definitions ........................................................................................................16
...................................................................................................................................17
7.3. Probe Association............................................................................................17
8. SCREEN DEFINITIONS –Thermocouple Models.................................... 18
9. CALIBRATION –Thermocouple Models ................................................. 21
9.1. Theory of Calibration........................................................................................21
9.2. Meter Calibration..............................................................................................21
mV Meter Calibration Window.............................................................................21
Set Active Calibration? Window.........................................................................22
Set Factory Calibration? Window (DSTCAL-Pro only).......................................22
9.3. Cold Junction Compensation Calibration Window............................................23
Set Active Calibration? Window.........................................................................23
Set Factory Calibration? Window (DSTCAL-Pro only).......................................23
10. TROUBLESHOOTING................................................................................ 24

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1. INTRODUCTION
This software package is for use with the DST400, DST/DSX500 and DST600 family of
Digital Thermometers. There are 2 versions of software, one for customer use and one
for use by the factory. The version is indicated on the first line under the “Poll for
Module” button. The 2 versions are:
1.1.DSTCAL
Allows the following:
Setting of LCD Refresh (display update rate) for all models;
R0 Value for all RTD models;
Selection of Thermocouple Type for all Thermocouple models;
Programming of the 4-mA value, 20-mA value and burnout selection on the
DSX models;
Association and enabling of probe ID’s for DST600 series Models;
Setting of Low Battery Check rate;
Calibration of the meter’s measurement electronics, resistance input for RTD
models and mV input for T/C models;
Calibration of the meter and probe using an ice bath for RTD versions;
Calibration of the Cold Junction Compensation electronics for T/C versions;
Calibration of the 4-20 mA output circuit for DSX models
NOTE: This software does not calibrate the transmitter section of Models
DST620 or DST621, which require the transmitter manufacturer’s software
and interface module.
1.2.DSTCAL-Pro
Only available for the Wahl Factory, same as DSTCAL but also allows setting of
the unit’s serial number and setting of the Factory default calibration values.

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2. DSTCAL KIT INSTALLATION AND SETUP
2.1.Kit Contents
The DSTCAL Kit is delivered with a CD-ROM that includes the following files:
Application files
Autorun.inf
DSTCAL.application
Setup.exe
WD1035 –DSTCAL Load Instructions
WD1037 –DSTCAL User Manual
The DSTCAL kit also includes:
P/N Description
12436-07 Cable, USB2.0A to Mini-B, 5 pin, 6 Ft.
13506 DST/USB Interface Module
13507 Cable, DST/13506 Interface, 4 pin
2.2.DSTCAL Software Installation
1. Install DSTCAL CD-ROM into the computers CD drive and the “AutoPlay”
window should pop up.
2. Click on “Run setup.exe”
3. Follow the on-screen prompts.
2.3.Hardware Installation
1. Connect the 12436-07 cable, with the USB2.0A end to your PC’s USB port
and the Mini-B connector to the USB port on the DST/USB Interface
Module.
2. Connect the 4 pin cable assembly, p/n 13507, to the DST/USB Interface
Module port labeled “DIGI-STEM”.
3. With the Digi-Stem unit open, connect the opposite end of the 13507 cable
to J3 on the back of the PCB assembly with the RED wire going to Pin 1.
Pin 1 is marked on the PCB and is the pin closest to the blue jumper for
the °C/°F switch.
2.4.Driver Installation
Once the software is loaded and the hardware is connected, your computer may
report that it needs a driver for the interface box. Usually, the automatic driver
search window will find it. If not, you can manually load the driver by:
1. Open your web browser and go to www.ftdichip.com
2. On the left hand menu, click on “Drivers”, and then click on the sub menu
of “VCP Drivers”.
3. Scroll down to the table labeled “Currently supported VCP Drivers:”
4. Find your operating system, such as “Windows – X86 (32-bit) and click on
the version in the table, ie. 2.08.28.
5. Follow the auto install wizard.
6. Close the web browser.

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3. SCREEN DEFINITIONS –RTD Models
Wahl DST/DSX Series Calibration Software (vX.X.X.XX) window; reference Fig. 1.
Note: Rolling the mouse indicator over a title or box will show additional information on
the specific subject.
File:
Activation –This command allows entry of the Activation Key to change between
versions. User installation installs the DSTCAL version. Key for DSTCAL-Pro is only
available for the factory.
Check for updates –Checks the Wahl Instruments website (www.palmerwahl.com) to
see if there are updates available and reports status of your software. Software will
prompt you to download new software if it is available.
Exit –Closes the Calibration Software
Settings:
Fahrenheit / Celsius - Selects Fahrenheit or Celsius as the temperature scale to be
used when programming the 4 mA and 20 mA values (DSX models only).
SPY COM - Serial Communication Debug Tool. Not used during normal operation.
Help:
About –Displays software version and contact information for Wahl Instruments.
Select “OK” to close.
Poll for Module:
This button is used to establish communication between the PC and the Instrument
being programmed/calibrated. In some cases, it may need to be clicked multiple times,
but usually no more than three.
Select COM Port:
This button opens the COM port selection window. This is used to select the proper
COM port. If the COM port the module is connected to does not show, click “Refresh”
then “Scan All COM Ports”. Highlight the COM port and click “OK”.
Module Configuration Information
Module settings for S/N 99999001: Identifies serial number of instrument.
Size: Size of the configuration data in bytes.
Model: Identifies instruments model number currently connected to DSTCAL software.
Firmware Revision: Identifies firmware revision of instrument.
Build Date: Identifies date firmware was compiled.

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Build Time: Identifies time firmware was compiled.
Hardware Revision: Identifies Hardware revision level. This parameter is hard coded
into firmware.
Serial number: Identifies serial number of PCB, programmable on DSTCAL-Pro only.
LCD Refresh: Sets update period for the LCD. 1 period = 250 mS, thus, LCD Refresh:
2 = 500 mS or 0.5 second update rate for LCD. Default value is 8. LCD Refresh is not
available for model DST550, which is hard programmed for sample intervals.
Low Battery Check: Sets update period for checking of low battery. 1 period = 250
mS, thus Low Battery Check: 1200 = 300,000 mS or 5 minute interval for battery
checking.
Calibration Information
Module Calibration Data –RTD Models
Active Rref –Resistance of nominal 248 ohm reference resistor as calculated by
measurements during the Ohm Meter Calibration process.
Active Roffset –Offset value for reference resistor as calculated by measurements
during the Ohm Meter Calibration process.
R0 –Resistance at 0.0C. R0 value is used for calculating temperature from the
measured resistance. For the highest accuracy of measurements, it should be set to
match the R0 value of the probe being used. It may be manually entered or may be
automatically calculated and updated by performing “Probe (system) Calibration”. Box
will turn “red” if value is out of acceptable range of 100 10 ohms.
Select Calibration to Perform: The Drop down box allows the user to select one of two
calibration routines. To select, simply highlight the desired routine and click the
“Calibrate” button. A calibration routine with step by step instructions will take you
through the calibration process. See DSX section for DSX current loop calibration
instructions.
1) Ohm Meter Calibration –Performs the calibration of the Electronics to ensure
it accurately measures resistance. This routine requires the use of known
precision resistances. A precision resistor decade box or precision fixed
resistors may be used. Some electronic RTD simulators may also work, but we
recommend validating their use with the Digistem prior to using them for
calibration. R0 will automatically be set to 100.00 ohms for this calibration and
upon completion, the user will be given the option to return to the initial R0 or
leave it at 100.00 ohms.

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2) Probe (system) Calibration –Performs the calibration of the RTD probe to
the meter electronics. This method can be performed when equipment to
measure the probes R0 value is not available. This should not be performed if
the R0 value is manually entered into the R0 field.
Existing Meter Calibration Settings
Factory –These settings are the default settings and can only be set at the factory.
Active –These settings are the calibration coefficients used in calculating temperature
from the measured probe resistance. These may be changed by the user via the “Ohm
Meter Calibration” routine.
Restore Factory Settings –This button loads the “Active” settings registers with the
current values displayed under the “Factory” settings. This is used in the event the
“Active” settings have been corrupted by invalid calibration.
NOTE: Restoring the Factory settings will cause the current active settings to be
deleted. A new calibration will need to be performed if new “Active” settings need to be
acquired.
Showing info box when mouse is over “LCD Refresh:” title.
Fig. 1

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4. CALIBRATION –RTD Models
4.1.Theory of Calibration
With respect to calibration, the RTD thermometer can be viewed as two independent
systems with different calibration requirements.
The first system is comprised of the meter electronics. The meter calibration is
performed so that the meter will measure resistance accurately. This is accomplished
by using known, fixed resistances of a specified accuracy. Wahl recommends using
resistances with a known accuracy equal to or greater than 0.009 ohms. The
calibration routine also allows entry of the exact resistance. This will allow the
technician to enter the calibrated resistor value from a NIST traceable laboratory data
sheet or by measuring a nominal valued resistance with a precision ohmmeter, such as
an HP3458A, and entering the measured value. See “METER CALIBRATION” below
for details.
The second system is the addition of a specific probe to the meter. Due to
manufacturing processes, there are variations in the RTD’s R0 coefficient. To increase
the total system accuracy, the electronics may be programmed with this value so that
the microprocessor can accurately calculate the actual temperature from the measured
resistance. See “PROBE CALIBRATION” below for details.
4.2.Meter Calibration
Ohm Meter Calibration Window
Selecting Resistance Screen
1. Sets R0 to 100 ohms in the event it is set otherwise.
2. Prompts user to “Connect 50 ohm Standard Resistance to Meter Input”
(90 ohm for DST600 series), user may optionally enter exact value of
Resistance into the “Measured Resistance” box. Box will turn “red” if
value is out of acceptable range.
3. Click “Next” to continue (Clicking “Cancel” will return to main screen).
Waiting for Stabilization Screen
4. Unit waits 10 seconds for stabilization of capacitors
Averaging Samples Screen
5. Unit takes 10 readings to average for calibration
Selecting Resistance Screen
6. Prompts user to “Connect 280 ohm Standard Resistance to Meter
Input” (194.1 ohm for DST600 series), user may optionally enter exact
value of Resistance into the “Measured Resistance” box.
7. Click “Next” to continue (Clicking “Cancel” will return to main screen).
Waiting for Stabilization Screen
8. Unit waits 10 seconds for stabilization of capacitors

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Averaging Samples Screen
9. Unit takes 10 readings to average for calibration
Finalizing Calibration Screen
10.Displays results of calibration
11.Click “Set Calibration” to continue (Clicking “Cancel” will return to main
screen).
Set Active Calibration? Window
12.Do you wish to calibrate the module with the values below?
Set Active calibration pair to:
(xxx.xxxx, x.xxxx)
13.Click “Yes” to continue. Clicking “No” will return to Finalizing
Calibration Screen. “Pro” version will send to “Set Factory
Calibration?” window, below.
Set Factory Calibration? Window (DSTCAL-Pro only)
14.Do you wish to calibrate the module with the values below?
Set Factory calibration pair to:
(xxx.xxxx, x.xxxx)
15.Click “Yes” to continue or “No” to return to Finalizing Calibration
Screen
Meter Calibration Success Window
16.One of the following 3 messages will be displayed, depending on
previous choices:
A meter calibration was performed successfully on this module.
Both Active and Factory calibration set to:
(xxx.xxxx, -x.xxxxxx)
A meter calibration was performed successfully on this module.
Only Active calibration set to:
(xxx.xxxx, -x.xxxxxx)
A meter calibration was performed successfully on this module.
Only Factory calibration set to:
(xxx.xxxx, -x.xxxxxx)
17.Click “OK”. Program displays the following message:

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Press yes to return R0 to its original value or press no to leave R0 set
to 100.00 ohms.
4.3.Probe Calibration
There are two methods of calibrating the probe to the meter. The first method is done
without the aid of the “Probe (system) Calibration” routine found under the “Select
Calibration to Perform” window. For this method, a precision 4-wire ohmmeter is
required. The second method can be used if a precision 4-wire ohmmeter is not
available.
Probe with Precision 4-wire Ohmmeter Calibration
1. Insert the probe (disconnected from the Digistem) into an ice bath
and allow it to stabilize.
2. Measure its resistance with a precision 4-wire ohmmeter.
3. Enter the measured resistance value into the R0 field of the
Calibration software.
4. Click the “SET” button.
Probe without Precision 4-wire Ohmmeter Calibration -
Probe (system) Calibration Window
1. Click on the “Select Calibration to Perform” drop down box, and select
“Probe (system) Calibration”
2. Click the “Calibrate” button
3. “Placing probe in Ice Bath” window will open. Place probe in Ice Bath
and allow to stabilize.
4. Click “Next” button. (Click “Cancel” to abort the calibration)
5. “Waiting for stabilization” window will appear for 10 seconds, followed
by “Averaging Samples” window. When the sample count gets to 10
the “Capture R0 button will become active. The software continues to
collect samples at approximately once per second and displays a
“running average” of the most recent 10 samples. This allows the user
to verify the probe has stabilized in the ice bath.
6. When the probe stability is acceptable, click “Capture R0”.
7. “Capture R0” window will appear asking if you wish to use this value
for R0. Click “Yes” to capture or “No” to return to the Averaging
samples window. The unit will continue to collect samples and display
them. You may re-capture R0 or Cancel to exit the program.

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8. Software will display “Probe Calibration Success” window.
9. Click OK
10.Software will return to main screen and new value will be loaded into
the R0 register and window.
4.4.Error Windows
The following error box may occur when in the Meter Only Calibration routine and if the
input resistance is not within approximately 4 ohms of the requested nominal setting.
One or both of the following error messages may occur when in the Meter Only
Calibration and the calculated calibration values don’t meet the expected results. The
most likely cause of this is that the resistances applied were not equal to the specified
resistance or the resistance was changed during the calibration measurements. This
may be corrected by entering the actual resistance of the standard used.

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5. SCREEN DEFINITIONS - DSX Models:
Additionally to the previous standard definitions the DSX model software contains the
following, reference Fig. 2:
Module Configuration Information
Module settings for S/N xxxxxxxx:
4 mA Temp. (C): 0.0: Shows the equivalent current setting for the 4-mA output in F or
C. Temperature scale is changed under the “Settings” menu. The 4-mA value must be
a minimum of 10C (18F) below the 20-mA setting.
20 mA Temp. (C): 100.0: Shows the current setting for the 20-mA output in F or C.
Temperature scale is changed under the “Settings” menu. The 20-mA value must be a
minimum of 10C (18F) above the 4-mA setting.
Burnout Setting: 22.0 Upscale (22.0 mA): User selectable setting for fault indication to
drive the current to a low or high setting in the event a sensor gets disconnected, or
opens. The current values are selected to comply with the NAMUR recommendation
NE43 (18.01.1994). The two settings available from the drop down menu are:
Upscale (22.0 mA) –drives the current to 22.0 mA if fault is detected.
Downscale (3.5 mA) –drives the current to 3.5 mA if fault is detected.
Calibration Information
Module Calibration Data
4-20 mA Cal. Slope: 0.000244 - Displays slope correction for D/A converter.
4-20 mA Cal. Offset: -0.00925 –Displays offset correction for D/A converter.
Select Calibration to Perform: For DSX models, there is a third option on the “Select
Calibration to Perform” drop down box that allows the user to perform calibration of the
current loop output. Select the “4-20 mA Calibration” and click the “Calibrate” button. A
calibration routine with step by step instructions will take you through the calibration
process.
4-20 mA Calibration –Performs calibration of the electronics for the 4-20 mA current
output. This calibration requires a precision current meter with resolution of 1 microamp
or less.

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Fig. 2

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6. CALIBRATION –DSX Current Loop
6.1.Theory of Calibration
Calibration of the 4-20 mA current loop is performed by selecting the “4-20 mA
Calibration” on the drop down menu and following the on-screen prompts. This routine
performs calibration of the absolute current. It is not intended to make adjustments for
temperature to current equivalency. The Module Settings portion of Module
Configuration Information should be used for temperature assignments.
6.2.Current Loop Calibration
4-20 mA Calibration Window
Enter Measured Current (~4 mA) Screen
1. Forces DSX unit to output 4 mA signal and prompts user to enter actual value
measured on precision DC current meter. Box will turn “red” if value is out of
acceptable range.
2. Click “Next” to continue or “Cancel” to abort.
Enter Measured Current (~20 mA) Screen
3. Forces DSX unit to output 20 mA signal and prompts user to enter actual
value measured on precision DC current meter. Box will turn “red” if value is
out of acceptable range.
4. Click “Next” to continue or “Cancel” to abort.
Verify Output Current Screen
5. Forces unit to output 20 mA. Prompts user to verify the output current using a
precision DC current meter.
6. Click “Yes” if current is within .002 mA and calibration will be complete with
new coefficients being loaded into registers.
7. Click “No” if current is not within .002 mA and routine will restart to perform
calibration again.
If the error is greater than .002 mA we suggest running the calibration routine
again. Typing a wrong value in one of the windows is a likely cause of error. In
the event the unit cannot be calibrated, please contact the factory.

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7. DST600 PROBE ID
7.1.Theory of Operation
Probe ID allows a specific probe to be associated with a specific meter. The meter
will only display a temperature when it has the correct probe connected to it. The
primary reason for this association is that in case of a failed probe, it helps prevent
someone from replacing the probe without going through a calibration process. The
unit will display “Prb” indicating an unauthorized probe is being used. To authorize a
new probe, the unit must be connected to the programming or calibration software,
where it is recommended the unit be recalibrated to ensure accuracy. The Probe ID
may be overridden using the Enable Probe ID field. When the box is checked, the
probe ID will function normally. Unchecked will disable the feature. Due to the
technology used, on remote cables with connectors the Probe ID has a limit of about
28 meters (92 feet) maximum cable length.
Fig. 3
7.2.Definitions
(Reference Fig. 3) Additionally to the previous standard definitions, the DST600
software contains the following information for Probe ID:
Module Calibration Data

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Probe ID: 0536B5120000 - Displays serial number of current probe with which the
module is associated.
7.3.Probe Association
Upon connecting a unit to the pc and starting the software the unit is connected via the
“Poll for Module” button. If the probe connected to the unit is not the one associated
with the DST600 the following screen will appear:
Clicking “OK” will close this window. To associate the new probe, click the “Capture
Probe” button (Fig. 3).
The following screen will appear:
To associate the new probe, clicks yes, otherwise click no and the current probe will
remain associated.
Upon association of the new probe, the DST600 display should change from “Prb” to
the current temperature being measured by the probe within a few seconds.
- Used to associate a new probe with the DST600.
Capture
Probe
Enable Probe ID: Not Enabled Enable Probe ID
Shows current status of Probe ID

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8. SCREEN DEFINITIONS –Thermocouple Models
Wahl DST/DSX Series Calibration Software (vX.X.X.XX) window
Note: Rolling the mouse indicator over a title or box will show additional information on
the specific subject. Reference Fig. 4.
File:
Activation –This command allows entry of the Activation Key to change between
versions. User installation installs the DSTCAL version. Key for DSTCAL-Pro is only
available for the factory.
Check for updates –Checks the Wahl Instruments website (www.palmerwahl.com) to
see if there are updates available and reports status of your software. Software will
prompt you to download new software if it is available.
Exit –Closes the Calibration Software
Settings:
Fahrenheit / Celsius - Selects Fahrenheit or Celsius as the temperature scale to be
used when programming the 4 mA and 20 mA values (DSX models only- currently not
available on 400 series).
Help:
About –Displays software version and contact information for Wahl Instruments.
Select “OK” to close.
Poll for Module:
This button is used to establish communication between the PC and the Instrument
being programmed/calibrated. In some cases, it may need to be clicked multiple times,
but usually no more than three.
Select COM Port:
This button opens the COM port selection window. This is used to select the proper
COM port. If the COM port the module is connected to does not show, click “Refresh”
then “Scan All COM Ports”. Highlight the COM port and click “OK”.
Module Configuration Information
Module settings for S/N 99999001: Identifies serial number of instrument.
Size: Size of the configuration data in bytes.
Model: Identifies instruments model number currently connected to DSTCAL software.
Firmware Revision: Identifies firmware revision of instrument.

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Build Date: Identifies date firmware was compiled.
Build Time: Identifies time firmware was compiled.
Hardware Revision: Identifies Hardware revision level. This parameter is hard coded
into firmware.
Serial number: Identifies serial number of PCB, programmable on DSTCAL-Pro only.
LCD Refresh: Sets update period for the LCD. 1 period = 250 mS, thus, LCD Refresh:
2 = 500 mS or 0.5 second update rate for LCD. Default value is 8.
Low Battery Check: Sets update period for checking of low battery. 1 period = 250
mS, thus Low Battery Check: 1200 = 300,000 mS or 5 minute interval for battery
checking.
Thermocouple Type –Allows selection of J, K, E, T or S thermocouples. Changing of
the thermocouple type requires the recalibration of the Cold Junction Compensation
using the newly selected thermocouple type cable and input source. See section XXXX
for instructions. Selection will display the following Caution:
Calibration Information –Thermocouple Models
Module Calibration Data –Thermocouple Models
mV Cal. Slope –Slope correction value for millivolt measurement as calculated by
measurements during the Millivolt Calibration process. Displays active values used for
the measurement.
mV Cal. Offset –Offset correction value for millivolt measurement as calculated by
measurements during the Millivolt Calibration process. Displays active values used for
the measurement.
Select Calibration to Perform:

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Millivolt Calibration: Used to calibrate the mV measurement capabilities of the meter.
This is performed by inserting known millivolt signals via copper wires to the DST400
input connector. If this calibration is going to be performed, it must be performed before
the Cold Junction Calibration, as Millivolt Calibration will alter the Cold Junction
Calibration.
Cold Junction Calibration: Used to calibrate the Cold Junction Compensation
correction for a given thermocouple type. This is performed by using a Thermocouple
Simulator to insert a 25°C equivalent signal, via thermocouple wire of the selected type,
to the DST400 input connector. This calibration must be performed after changing
thermocouple type.
Existing Thermocouple Calibration Settings
Factory –These settings are the default settings and can only be set at the factory.
Restore Factory Settings –This button loads the “Active” settings registers with the
current values displayed under the “Factory” settings. This is used in the event the
“Active” settings have been corrupted by invalid calibration.
NOTE: Restoring the Factory settings will cause the current active settings to be
deleted. A new calibration will need to be performed if new “Active” settings need to be
acquired.
Showing info box when mouse is over “LCD Refresh:” title.
Fig. 4